Common fuels for (adapted) diesel engines are fossil diesel fuel, fatty acid methyl ester (FAME or biodiesel) or vegetable oils. Further potential biogenic substitutes are the citric acid esters tributylcitrate (TBC) and triethylcitrate (TEC). Their use as fuel was applied for a patent in Germany in 2010. Proposed advantages are low soot combustion, independence of energy imports due to the possibility of local production and a broad raw material base. Comparison of their properties with...